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US 9,073,625 B1Granted
Helicopter rotor yoke
AssigneeTextron Innovations Inc.
InventorsTheodore W. Ingram, III, James L. Braswell, Jr., Dharam J. Reddy
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Abstract
A helicopter rotor yoke includes a composite laminate having a plurality of plies of fibers disposed in a polymeric matrix. The polymeric matrix includes a toughened polymer at one of a location or zone that experiences high strain levels during use of the rotor yoke.
Claims13
A helicopter rotor yoke, comprising:
- a composite laminate including a plurality of plies of fibers disposed in a polymeric matrix, having a flexure portion at one of a location or zone that experiences high strain levels during use of the rotor yoke, the composite laminate having;
- a first ply;
- a second ply;
- a partially extending ply that partially extends through the composite laminate located between the first ply and the second ply;
- wherein a void is created by the partially extending ply between the first ply and the second ply;
- the flexure portion in the composite laminate disposed proximate an end of the partially extending ply;
- a layer of toughened polymer disposed between the first ply and the partially extending ply;
- a layer of toughened polymer disposed in the flexure portion in the composite laminate between the first ply and the second ply, thereby filling the void from the partially extending ply;
- a layer of toughened polymer disposed between the second ply and the partially extending ply;
- wherein the layers of toughened polymer elastically deforms inhibiting delamination of the helicopter yoke.
7 more elements
Dependencies are inferred from the claim text.